McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Civil Engineering .
| 151. |
Plain chlorination is adopted for treating the water having turbidities less than 20 to 30 ppm. |
| A. | Correct |
| B. | Incorrect |
| Answer» A. Correct | |
| 152. |
The formula, F = R - K (1.8 T + 32), for obtaining the annual run-off is known as |
| A. | Justin's formula |
| B. | Vermule's formula |
| C. | Inglis formula |
| D. | Khosla's formula |
| Answer» D. Khosla's formula | |
| 153. |
The product of H+ ions and OH- ions in a water solution is equal to |
| A. | 0 |
| B. | 10?1 |
| C. | 10?7 |
| D. | 10?14 |
| Answer» D. 10?14 | |
| 154. |
The water supplysystem should be designed for the present population only. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 155. |
Dissolved impurities consist of |
| A. | bacteria |
| B. | iron |
| C. | slit |
| D. | fungi |
| Answer» B. iron | |
| 156. |
Water is forced at a preseure higher than the atmospheric pressure in rapid gravity filters. |
| A. | Right |
| B. | Wrong |
| Answer» B. Wrong | |
| 157. |
Plain sedimentation is a process of retaining water in a basin so that the suspended particles settles down as a result of the |
| A. | action of sun-rays |
| B. | action of gravity and forces |
| C. | action of velocity of the particles |
| D. | none of these |
| Answer» B. action of gravity and forces | |
| 158. |
The pipe through which liquid waste carrying human excreta flows, is called |
| A. | waste pipe |
| B. | soil pipe |
| C. | vent pipe |
| D. | all of these |
| Answer» B. soil pipe | |
| 159. |
Which of the following formula is used for computing the quantity of water for fire demand? |
| A. | Freeman's formula |
| B. | Kuichling formula |
| C. | Buston's formula |
| D. | all of these |
| Answer» D. all of these | |
| 160. |
The finely divided dispersion of solid particles which are not visible to the naked eye and cannot be removed by ordinary filters are known as |
| A. | suspended impurities |
| B. | dissolved impurities |
| C. | colloidal impurities |
| D. | none of these |
| Answer» C. colloidal impurities | |
| 161. |
Rate of filteration of a slow sand filter ranges from |
| A. | 10 to 100 litres / h / m2 |
| B. | 100 to 200 litres / h / m2 |
| C. | 200 to 400 litres / h / m2 |
| D. | 400 to 1000 litres / h / m2 |
| Answer» B. 100 to 200 litres / h / m2 | |
| 162. |
For large sewers, the maximum distance between manholes should be |
| A. | 75 m |
| B. | 150 m |
| C. | 200 m |
| D. | 300 m |
| Answer» D. 300 m | |
| 163. |
The velocity of flow in any sedimentation tank should not exceed |
| A. | 0.05 mm/s |
| B. | 0.5 mm/s |
| C. | 5 mm/s |
| D. | 50 mm/s |
| Answer» C. 5 mm/s | |
| 164. |
Which of the following statement is correct? |
| A. | The rate of silting in a reservoir is more in the beginning and less in the end. |
| B. | At the economical height of a dam, its cost per million cubic metre of storage is minimum. |
| C. | The percentage of water required for public use amounts to about 10% of the total water requirements. |
| D. | all of the above |
| Answer» D. all of the above | |
| 165. |
An arrangement for back washing is provided in |
| A. | slow sand filter |
| B. | sedimentation tank |
| C. | rapid sand filter |
| D. | all of these |
| Answer» C. rapid sand filter | |
| 166. |
The seqage is treated by aerobic bacteria action in |
| A. | settling tank |
| B. | crickling filter |
| C. | oxidation pond |
| D. | all of these |
| Answer» C. oxidation pond | |
| 167. |
Ventilation of house drainage is required to |
| A. | relieve the pressure of foul gases |
| B. | dilute the fould air in the drain |
| C. | reduce the obnoxious effect of foul air |
| D. | all of these |
| Answer» D. all of these | |
| 168. |
By base exchange method, water of zero degree hardness can be obtained. |
| A. | Yes |
| B. | No |
| Answer» A. Yes | |
| 169. |
The alkalinity in water is caused by |
| A. | sodium carbonate |
| B. | potassium carbonate |
| C. | calcium hydroxide |
| D. | all of these |
| Answer» D. all of these | |
| 170. |
The quantity of liquid waste which flows in sewers during rainy season is called |
| A. | storm sewage |
| B. | dry weather flow |
| C. | sanitary sewage |
| D. | industrial waste |
| Answer» A. storm sewage | |
| 171. |
Cleaning period for a rapid sand filter is taken as |
| A. | 2 to 3 hours |
| B. | 2 to 3 days |
| C. | 2 to 3 weeks |
| D. | 2 to 3 months |
| Answer» B. 2 to 3 days | |
| 172. |
The activated sludge |
| A. | contains fertilising constituents |
| B. | indicates the degree of aeration |
| C. | indicates high water content |
| D. | all of these |
| Answer» D. all of these | |
| 173. |
Lead should be present in large quantity in water. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 174. |
The water obtained from a lake is known as surface water. |
| A. | Agree |
| B. | Disagree |
| Answer» A. Agree | |
| 175. |
The most commonly used disinfectant for drinking water throughout the world is |
| A. | alum |
| B. | nitorgen |
| C. | lime |
| D. | chlorine |
| Answer» D. chlorine | |
| 176. |
In high rate activated sludge treatment, bacterias are removed from |
| A. | 20 to 40% |
| B. | 40 to 60% |
| C. | 60 to 80% |
| D. | 80 to 95% |
| Answer» D. 80 to 95% | |
| 177. |
The water mains should be designed for |
| A. | 100% |
| B. | 150% |
| C. | 225% |
| D. | 250% |
| Answer» C. 225% | |
| 178. |
Pressure filters are not used for treating municipal water supplies, because |
| A. | the rate of filteration is high |
| B. | the overall plant capacity is small |
| C. | they are inefficient in the removal of turbidity and bacterias |
| D. | they are more costly |
| Answer» D. they are more costly | |
| 179. |
The process of killing pathogenic bacterias from water is called |
| A. | sedimentation |
| B. | filteration |
| C. | coagulation |
| D. | disinfection |
| Answer» D. disinfection | |
| 180. |
Bacterias which cause disease are called |
| A. | anaerobic bacteria |
| B. | facultative bacterias |
| C. | aerobic bacteria |
| D. | none of these |
| Answer» D. none of these | |
| 181. |
The sewage should be disposed off without causing odour and nuisance. |
| A. | Right |
| B. | Wrong |
| Answer» A. Right | |
| 182. |
The permanent hardness in water is caused due to the salts like |
| A. | chlorides |
| B. | nitrates |
| C. | sulphates |
| D. | all of these |
| Answer» D. all of these | |
| 183. |
The sodium carbonate in water |
| A. | causes bad taste |
| B. | softens the water |
| C. | increases hardness of water |
| D. | stops epidemic |
| Answer» B. softens the water | |
| 184. |
An artesian spring is formed |
| A. | when an aquifer gets exposed in a valley against a vertical cut |
| B. | due to continuous fault in a rock through which water under pressure comes out |
| C. | when a porous strata gets enclosed between two impervious strata |
| D. | none of the above |
| Answer» C. when a porous strata gets enclosed between two impervious strata | |
| 185. |
If the size of the sewer is small, then the velocity of flow will be high. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 186. |
Slow sand filter is efficient to remove the bacterias from the raw water to an extent of |
| A. | 50% |
| B. | 70% |
| C. | 85% |
| D. | 99% |
| Answer» D. 99% | |
| 187. |
The bacteria which can survive without oxygen is called |
| A. | anaerobic bacteria |
| B. | pathogenic bacteria |
| C. | aerobic bacteria |
| D. | non-pathogenic bacteria |
| Answer» A. anaerobic bacteria | |
| 188. |
For large cities, the suitable method for forecasting population is |
| A. | arithmetical increase method |
| B. | graphical method |
| C. | geometrical increase method |
| D. | comparative method |
| Answer» A. arithmetical increase method | |
| 189. |
When the sewage is to be distributed over a level area surrounded by dykes (i.e. trenches), the mothod of sewage used is called |
| A. | flooding |
| B. | surface irrigation |
| C. | ride and furrow |
| D. | spray irrigation |
| Answer» A. flooding | |
| 190. |
In order to control the flow of water through pipes, a |
| A. | scour valve |
| B. | air valve |
| C. | gate valve |
| D. | safety valve |
| Answer» C. gate valve | |
| 191. |
The underground structure in the form of a circular or rectangular tank for the purposes of admitting sewage into it from the intercepting chamber is called a |
| A. | septic tank |
| B. | cess pool |
| C. | privy pit |
| D. | soak pit |
| Answer» B. cess pool | |
| 192. |
A sewer which gets discharge from two or more main sewers is called |
| A. | main sewer |
| B. | trunk sewer |
| C. | combined sewer |
| D. | intercepting sewer |
| Answer» B. trunk sewer | |
| 193. |
Zeolite is |
| A. | hydrated silica |
| B. | sodium silicate |
| C. | dehydrated calcium silicate |
| D. | none of these |
| Answer» B. sodium silicate | |
| 194. |
In orthotolodine test, safe residual for drinking water is indicated by |
| A. | yellow colour |
| B. | green colour |
| C. | lemon yellow colour |
| D. | none of these |
| Answer» A. yellow colour | |
| 195. |
The secondary treatment of sewage is carried out by the use of |
| A. | screens |
| B. | grit chambers |
| C. | trickling filters |
| D. | chlorinators |
| Answer» C. trickling filters | |
| 196. |
According to Indian standards, 45 litres of water per person per day is provided in case of |
| A. | hotels |
| B. | hostels |
| C. | offices |
| D. | all of these |
| Answer» C. offices | |
| 197. |
The plain ends of cast iron pipes are joined by |
| A. | spigot and socket joint |
| B. | flanged joint |
| C. | victuallic joint |
| D. | dresser coupling joint |
| Answer» D. dresser coupling joint | |
| 198. |
Pressure filters are best suited for |
| A. | swimming pools |
| B. | railway stations |
| C. | individual industries |
| D. | all of these |
| Answer» D. all of these | |
| 199. |
A pressure relief valve is provided to prevent |
| A. | the water flowing out of the suction pipe |
| B. | the back flow, when the pump is stopped |
| C. | the increase of pressure after certain safe limit |
| D. | all of the above |
| Answer» C. the increase of pressure after certain safe limit | |
| 200. |
Aerobic bacterias takes place in the |
| A. | presence |
| B. | absence |
| Answer» A. presence | |
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